Practice Questions 2 [Chapter 9-18] Book: Epidemiology [Leon Gordis]

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NUR 527: Fundamentals of Epidemiology

and Biostatistics for Nursing

Practice Questions 2 [Chapter 9-18]
Book: Epidemiology [Leon Gordis]
Due June 24, 2013

Answer only the questions specified and justify your answers.

Each question is “one point”. Total points=20 (10% of the course grade)

Chapter 9: questions 1, 2, 5 1. In cohort studies of the role of a suspected factor in the etiology of a disease, it is essential that: a. There be equal numbers of persons in both study groups b. At the beginning of the study, those with the disease & those without the disease have equal risks of having the factor c. The study group with the factor and the study group without the factor be representative of the
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Which of the following is a case-control study? a. Study of past mortality or morbidity trends to permit estimates of the occurrence of disease in the future b. Analysis of previous research in different places and under different circumstances to permit the establishment of hypotheses based on cumulative knowledge of all known factors c. Obtaining histories and other information from a group of known cases and from a comparison group to determine the relative frequency of a characteristic or exposure under study d. Study of the incidence of cancer in men who have quit smoking e. Both a and c
ANSWER: C
According to Gordis, “ A case-control study design is to examine the possible relation of an exposure to a certain disease, we identify a group of individuals with that disease (called cases) and, for purposes of comparison, a group of people without that disease (called controls). (pg. 178)
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8. In which one of the following types of study designs does a subject serve as his own control? a. Prospective cohort study b. Retrospective cohort study c. Case-cohort study d. Case-crossover study e. Case-control study
ANSWER: D
According to Gordis, “A crossover study has two advantages over a non-crossover longitudinal study. First, the influence of confounding covariates is reduced because each crossover patient serves as his or her own control”. (pg. 198)

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